The answer depends on the depth of the concrete. With a microscopically thin layer, you could probably get away with 1 [cubic] yard. On the other hand, a concrete pile that is several hundred feet high - will require a few(!) more yards.
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700 square feet = about 77.8 square yards. (77.7777778 square yards)
77.77 square yards.
77.77 square yards.
700 sq feet = 77.8 sq yards.
9 square feet = 1 square yard 700 square feet = 777/9 square yards